Add music file playlist removal

Going to the menu now unmounts all mounted music directories.  Meaning, the music in the playlist will be forgotten when the menu button is pressed.  Thus, you can now remove songs from the playlist.

Author: xNul

audio.lua

@@ -58,6 +58,7 @@ local is_paused = false
 local loop_toggle = config.loop
 local shuffle_toggle = config.shuffle
 local shuffle_history = {}
+local mount_history = {}
 
 if not love.filesystem.getInfo("music") then
   love.filesystem.createDirectory("music")
@@ -77,6 +78,11 @@ function audio.reload()
     audio.stop()
   end
 
+  -- Unmount all music directories.
+  for i,v in ipairs(mount_history) do
+    love.filesystem.unmount(v)
+  end
+  
   sample_sum = 0
   sample_counts = {0, 0, 0, 0, 0, 0, 0, 0}
   sounddata_array = {}
@@ -98,18 +104,23 @@ function audio.reload()
   rd_active = false
   is_paused = false
   shuffle_history = {}
+  mount_history = {}
 
 end
 
 --- Attempts to load music in the folder "mount".
+-- @param path string: Path of music folder to mount and load.
 -- @return boolean: True if successful.  False otherwise.
-function audio.music.load()
+function audio.music.load(path)
 
   if rd_active then
     return
   end
+  
+  mount_history[#mount_history+1] = path
 
   shuffle_history = {}
+  love.filesystem.mount(path, "mount")
   music_list = audio.music.recursiveEnumerate("mount")
 
   if not next(music_list) then

main.lua

@@ -317,8 +317,7 @@ function love.load()
       end
     end
   elseif config.init_location == "appdata" then
-    love.filesystem.mount("music", "mount")
-    appdata_music_success = audio.music.load()
+    appdata_music_success = audio.music.load("music")
   elseif config.init_location == "dragndrop" then
     dragndrop = true
   end
@@ -540,8 +539,7 @@ function love.keypressed(key, scancode, isrepeat)
 
       -- Select music from appdata.
       elseif key_int == 2 then
-        love.filesystem.mount("music", "mount")
-        appdata_music_success = audio.music.load()
+        appdata_music_success = audio.music.load("music")
       end
     end
 
@@ -568,8 +566,7 @@ end
 -- @param path string: Path of directory dropped.
 function love.directorydropped(path)
 
-  love.filesystem.mount(path, "mount")
-  audio.music.load()
+  audio.music.load(path)
 
 end